题解 | #获取所有非manager的员工emp_no#
获取所有非manager的员工emp_no
http://www.nowcoder.com/practice/32c53d06443346f4a2f2ca733c19660c
方法1：NOT IN+子查询
select emp_no
from employees
where emp_no not in (select emp_no from dept_manager);
方法2：LEFT JOIN左连接+IS NULL
SELECT e.emp_no
FROM employees AS e
LEFT JOIN dept_manager AS d
ON e.emp_no=d.emp_no
WHERE dept_no IS NULL;
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